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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 11
BKCSDE 35(11)
November 20, 2014 

The Novel SCN− Ion-selective Electrode Based on the 1-Benzyl-3-(4-nitrophenyl) thio-urea Ionophore
Kyungmi Lee, Dong Hyeon Kang, Ju Eun Choe, Mira Yun, Jung-Min You, Min Jeong Go, Junseong Lee, Seungwon Jeon*
Ion selective electrodes, Polymeric membrane electrode, SCN− selective electrode, Thio-urea
A potentiometric sensor based on the 1-benzyl-3-(4-nitrophenyl) thio-urea was synthesized and tested as an ionophore in PVC based membrane sensor towards SCN− ions. This membrane exhibits a linear stable response over a wide concentration range (1.0 × 10−5 to 1.0 × 10−2 M) with a slope of −59.2 mV/dec., a detection limit of log[SCN−] = −5.05, and a selectivity coefficient for thiocyanate against perchlorate anion of = −0.133. The selectivity series of the membrane is as follows: SCN− > ClO4 − > I− > NO3 − > HSO3 − > Cl− > HSO4 − > F− > CH3COO− > HCO3 − > Br− > H2PO4 − > SO3 2− > SO4 2− > CO3 2−. The proposed electrode showed good selectivity and a good response for the SCN− ion over a wide variety of other anions in pH 6.0 buffer solutions and has a fast response time of about < 5s. The influences of the membrane by pH, ionophore, and plasticizer were studied.
3175 - 3180
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